NSCoreDataCoreSpotlightDelegate crash: "Can't add store"

We are using Core Data with Core Spotlight integration and a small percentage of our users get a crash on app instantiation. It's very bizarre because 99% of the time it works fine and we have never seen this while developing. The NSInvalidArgumentException reads as "Can't add store" although we know that's not true in most cases because the spotlight database gets filled properly from our Core Data values and search generally works great.

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